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https://github.com/alliedmodders/amxmodx.git
synced 2024-12-24 13:55:36 +03:00
added CS hook to catch internal bot commands and rebuy commands for players
This commit is contained in:
David Anderson
parent
e3240214a3
commit
0377715cdc
157
dlls/cstrike/cstrike/CstrikeHacks.cpp
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157
dlls/cstrike/cstrike/CstrikeHacks.cpp
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@ -0,0 +1,157 @@
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#include "cstrike.h"
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#include <assert.h>
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#ifdef __linux__
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#include <sys/mman.h>
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#define PAGE_EXECUTE_READWRITE PROT_READ|PROT_WRITE|PROT_EXEC
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#endif
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/* Utils */
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unsigned char *UTIL_CodeAlloc(size_t size);
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void UTIL_CodeFree(unsigned char *addr);
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void UTIL_MemProtect(void *addr, int length, int prot);
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/* Detours */
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void CtrlDetour_ClientCommand(bool set);
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void Detour_ClientCommand(edict_t *pEdict, int retVal);
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int g_CSCliCmdFwd = -1;
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int *g_UseBotArgs = NULL;
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const char **g_BotArgs = NULL;
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/* Called on startup */
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void InitializeHacks()
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{
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CtrlDetour_ClientCommand(true);
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}
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void OnPluginsLoaded()
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{
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g_CSCliCmdFwd = MF_RegisterForward("CS_InternalCommand", ET_STOP, FP_CELL, FP_STRING, FP_DONE);
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}
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void ShutdownHacks()
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{
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CtrlDetour_ClientCommand(false);
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}
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void CtrlDetour_ClientCommand(bool set)
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{
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#if defined AMD64
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#error UNSUPPORTED
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#endif
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static unsigned char DetourOps[] =
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{
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'\x50', /* push eax ; just for safety */
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'\x68', '\x00', '\x00', '\x00', '\x00', /* push 0 ; space to store override rule */
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'\xff', '\x74', '\x24', '\x04', /* push [esp+4] ; push the edict pointer */
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'\xe8', '\x00', '\x00', '\x00', '\x00', /* call <gate> ; call our function */
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'\x58', /* pop eax ; remove 3rd push */
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'\x58', /* pop eax ; remove 2nd push */
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'\x85', '\xc0', /* test eax, eax ; do != 0 test now, flags will be saved */
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'\x58', /* pop eax ; remove 1st push */
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'\x74', '\x01', /* je <cont> ; if == 0, jump to where old func is saved */
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'\xc3' /* ret ; return otherwise */
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};
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static unsigned char DetourJmp = '\xE9';
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const unsigned int DetourBytes = 23;
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const unsigned int DetourCallPos = 11;
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const unsigned int DetourJmpPos = DetourBytes + CS_DETOURCOPYBYTES_CLIENTCOMMAND;
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const unsigned int DetourJmpBytes = 5;
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static unsigned char *FullDetour = NULL;
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void *target = MDLL_ClientCommand;
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unsigned char *paddr;
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if (!g_UseBotArgs)
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{
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#if defined __linux__
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#else
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/* Find the bot args addresses */
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paddr = (unsigned char *)target + CS_CLICMD_OFFS_USEBOTARGS;
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g_UseBotArgs = *(int **)paddr;
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paddr = (unsigned char *)target + CS_CLICMD_OFFS_BOTARGS;
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g_BotArgs = (const char **)*(const char **)paddr;
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#endif
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}
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if (set)
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{
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assert(FullDetour == NULL);
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FullDetour = UTIL_CodeAlloc(DetourBytes + CS_DETOURCOPYBYTES_CLIENTCOMMAND + DetourJmpBytes);
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/* Copy the main trampoline function */
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memcpy(FullDetour, DetourOps, DetourBytes);
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/* Copy our detour call into the trampoline */
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paddr = &FullDetour[DetourCallPos];
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*(unsigned long *)paddr = (unsigned long)Detour_ClientCommand - (unsigned long)(paddr + 4);
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/* Copy original bytes onto the end of the function */
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memcpy(&FullDetour[DetourBytes], target, CS_DETOURCOPYBYTES_CLIENTCOMMAND);
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/* Patch and copy the final jmp */
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paddr = &FullDetour[DetourJmpPos];
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*paddr++ = DetourJmp;
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*(unsigned long *)paddr = ((unsigned long)target + CS_DETOURCOPYBYTES_CLIENTCOMMAND)
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- (unsigned long)(paddr + 4);
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/* Now overwrite the target function with our trampoline */
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UTIL_MemProtect(target, CS_DETOURCOPYBYTES_CLIENTCOMMAND + 10, PAGE_EXECUTE_READWRITE);
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paddr = (unsigned char *)target;
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*paddr++ = DetourJmp;
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*(unsigned long *)paddr = (unsigned long)FullDetour - (unsigned long)(paddr + 4);
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} else {
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assert(FullDetour != NULL);
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/* Copy back the original function bytes */
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memcpy(target, &FullDetour[DetourBytes], CS_DETOURCOPYBYTES_CLIENTCOMMAND);
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/* Free memory used */
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UTIL_CodeFree(FullDetour);
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FullDetour = NULL;
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}
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}
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void Detour_ClientCommand(edict_t *pEdict, int retVal)
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{
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if (*g_UseBotArgs)
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{
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int client = ENTINDEX(pEdict);
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const char *args = *g_BotArgs;
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retVal = MF_ExecuteForward(g_CSCliCmdFwd, (cell)client, args);
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}
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}
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unsigned char *UTIL_CodeAlloc(size_t size)
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{
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#if defined WIN32
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return (unsigned char *)VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
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#else
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unsigned char *addr = (unsigned char *)memalign(sysconf(_SC_PAGESIZE), size);
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mprotect(base, size, PROT_READ|PROT_WRITE|PROT_EXEC);
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return addr;
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#endif
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}
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void UTIL_CodeFree(unsigned char *addr)
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{
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#if defined WIN32
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VirtualFree(addr, 0, MEM_RELEASE);
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#else
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free(addr);
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#endif
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}
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void UTIL_MemProtect(void *addr, int length, int prot)
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{
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#ifdef __linux__
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#define ALIGN(ar) ((long)ar & ~(sysconf(_SC_PAGESIZE)-1))
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void *addr2 = (void *)ALIGN(addr);
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mprotect(addr2, sysconf(_SC_PAGESIZE), prot);
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#else
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DWORD old_prot;
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VirtualProtect(addr, length, prot, &old_prot);
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#endif
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}
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@ -33,6 +33,11 @@
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* version.
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*/
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CCstrikePlayer g_players[33];
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int g_zooming[33] = {0};
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bool g_precachedknife = false;
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bool g_noknives = false;
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// Utils first
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bool UTIL_IsPlayer(AMX* amx, edict_t* pPlayer) {
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@ -1836,4 +1841,10 @@ void PlayerPreThink(edict_t *pPlayer)
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void OnAmxxAttach()
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{
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MF_AddNatives(cstrike_Exports);
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InitializeHacks();
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}
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void OnAmxxDetach()
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{
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ShutdownHacks();
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}
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@ -152,6 +152,15 @@
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#define OFFSET_HOSTAGEID 516 + EXTRAOFFSET // +29
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#endif
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#if defined __linux__
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#define CS_DETOURCOPYBYTES_CLIENTCOMMAND 9
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#else
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#define CS_DETOURCOPYBYTES_CLIENTCOMMAND 6
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#define CS_CLICMD_OFFS_USEBOTARGS 2
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#define CS_CLICMD_OFFS_BOTARGS 22
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#endif
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// Ids of weapons in CS
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#define CSW_P228 1
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//#define CSW_SHIELD 2
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@ -280,12 +289,15 @@ enum
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};
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// cstrike-specific defines above
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CCstrikePlayer g_players[33];
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int g_zooming[33] = {0};
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bool g_precachedknife = false;
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bool g_noknives = false;
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extern CCstrikePlayer g_players[33];
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extern int g_zooming[33];
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extern bool g_precachedknife;
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extern bool g_noknives;
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// Globals above
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void InitializeHacks();
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void ShutdownHacks();
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#define CHECK_ENTITY(x) \
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if (x < 0 || x > gpGlobals->maxEntities) { \
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MF_LogError(amx, AMX_ERR_NATIVE, "Entity out of range (%d)", x); \
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@ -151,6 +151,9 @@
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<File
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RelativePath="..\cstrike.cpp">
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</File>
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<File
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RelativePath="..\CstrikeHacks.cpp">
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</File>
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<File
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RelativePath="..\CstrikePlayer.cpp">
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</File>
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@ -52,12 +52,12 @@
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#define FN_AMXX_ATTACH OnAmxxAttach
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/** AMXX Detach (unload) */
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//#define FN_AMXX_DETACH OnAmxxDetach
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#define FN_AMXX_DETACH OnAmxxDetach
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/** All plugins loaded
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* Do forward functions init here (MF_RegisterForward)
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*/
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//#define FN_AMXX_PLUGINSLOADED OnPluginsLoaded
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#define FN_AMXX_PLUGINSLOADED OnPluginsLoaded
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/** All plugins are about to be unloaded */
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//#define FN_AMXX_PLUGINSUNLOADING OnPluginsUnloading
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